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The Met Office said there is a slim chance of snowfall starting today (Monday). By Thursday, temperatures are set to drop to as cold as -10C in some parts of Wales, with a chance of snow continuing into the early hours of Friday morning.

(Image: Ben Birchall/PA Wire)

(Image: Ben Birchall/PA Wire)

(Image: Ben Birchall/PA Wire)

Forecaster Derek Brockway described it as an "historical and memorable cold spell".

He said: "Snow showers spreading from the east reaching Wales on Tuesday.